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Loop Kabat AbM Chothia IMGT
L1 L24-L34 L24-L34 L26-L32 L27-L32
L2 L50-L56 L50-L56 L50-L52 L50-L51
L3 L89-L97 L89-L97 L91-L96 L89-L97
H1(Kabat Numbering) H31-H35B H26-H35B H26-H32..34 H26-H35B
H1(Chothia/Martin Numbering) H31-H35 H26-H35 H26-H32 H26-H33
H2 H50-H65 H50-H58 H52-H56 H51-H56
H3 H95-H102 H95-H102 H96-H101 H93-H102

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[1]Dondelinger M, Fil¨¦e P, Sauvage E, et al Understanding the Significance and Implications of Antibody Numbering and Antigen-Binding Surface/Residue Definition. Front Immunol. 2018 Oct 16;9:2278.
[2]Martin, A.C.R. Protein Sequence and Structure Analysis of Antibody Variable Domains. In: Kontermann, R., D¨¹bel, S. (eds) Antibody Engineering. Springer Lab Manuals. Springer, Berlin, Heidelberg£¬2001.

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